InnoDB 體系結構【Buffer Pool】

The buffer pool is an area in main memory where InnoDB caches table and index data as it is accessed. The buffer pool permits frequently used data to be processed directly from memory, which speeds up processing. On dedicated servers, up to 80% of physical memory is often assigned to the buffer pool.

LRU

buffer pool裡面很重要的一個結構是LRU連結清單，資料庫頁組成的連結清單。